Commodities
PrimaryCopper
SecondarySilver
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Model96: Native Cu
Deposit sizeL
Orebody formIRREGULAR
Ore controlConcentrated in shoots (stratigraphic in amygdaloid or fissure related).
Materials
Ore mineralsCopper, Silver
GangueQuartz, Calcite, Epidote, Pumpellyite-(Mg), Chlorite, Feldspar
Geology
Host rockBasalt · Portage Lake Volcanics
AlterationRemoval of hematite, copper replacement, quartz-pumpellyite bleaching
Economic & production
Development statusProducer
First production1863
Discovery year1855
Identification
Deposit ID10080400
MRDS IDW031529
Alternate namesFlintsteel
RegionNA
Data scoreB
Coordinates46.75139, -89.11924
References
COPPER RANGE CO., UNPUBLISHCOPPER RANGE CO., UNPUBLISHED, 1968, BEDROCK GEOLOGY MAP OF THE GREENLAND (SE 1/4) QUADRANGLE, ONTONAGON COUNTY, MICHIGAN. GEOLOGY MAPPED AND COMPILED BY COPPER RANGE EXPLORATION CO., INC., AND BY H. HUBBARD (U.S.G.S.)BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: U.S. GEOLOGICAL SURVEY PROF. PAPER 144, 238P.WILBAND J.T., 1978, THE COPPER RESOURCES OF NORTHERN MICHIGAN; PREPARED FOR THE U.S. BUREAU OF MINES, CONTRACT NO. J0366067, 66P.STATE OF MICHIGAN TAX COMMISSION, 1952-1958, APPRAISAL OF IRON AND COPPER MINES OF MICHIGAN; COMPILED ANNUALLY BY THE STATE TAX COMMISSION AND THE DEPARTMENT OF CONSERVATION, LOCATED AT THE GEOLOGICAL SURVEY DIVISION OF THE DEPARTMENT OF NATURAL RESOURCES, LANSING, MICHIGAN.JOHNSON, A.M., AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, ONTONAGON COUNTY, P 28-32, MICHIGAN DEPARTMENT OF NATURAL RESOURCES,BUTLER AND BURBANK (1929)